CN103071718A - Integral forming process method of thin-wall hooped tube workpieces - Google Patents
Integral forming process method of thin-wall hooped tube workpieces Download PDFInfo
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- CN103071718A CN103071718A CN2013100541188A CN201310054118A CN103071718A CN 103071718 A CN103071718 A CN 103071718A CN 2013100541188 A CN2013100541188 A CN 2013100541188A CN 201310054118 A CN201310054118 A CN 201310054118A CN 103071718 A CN103071718 A CN 103071718A
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Abstract
The invention discloses an integral forming process method of thin-wall hooped tube workpieces. The technical scheme comprises the flowing steps of: 1, preparing a mould: firstly forming overflow holes in corresponding parts on the mould, welding reinforcing ribs in a thin-wall tubing without welded lines in advance and placing into a mould cavity, performing spotting on the mould, sealing ends of a tube blank, filling a strain rate sensitive medium between the mould and the tube blank, then filling liquid forming medium in the tube blank and applying certain pressure; 2, forming: increasing the pressure of the inside liquid, meanwhile adjusting the flow state of the strain rate sensitive medium to cause a tube body and a reinforcing plate to be deformed in a coordinated way to form qualified parts; and 3, picking up the parts: reducing the pressure to 0MPa, opening the mould and then taking out the parts from the mould. The integral forming process method of the thin-wall hooped tube workpieces has the advantages of few forming processes, low manufacturing cost, high mechanical property of formed members, high dimension precision and the like, and is particularly suitable for forming thin-wall hooped tube workpieces with a sealed complex section shape.
Description
Technical field
The present invention relates to a kind of forming manufacturing method of sheet metal component, particularly a kind of integral forming process method of thin-walled ring muscle cylindrical member.
Background technology
The class that thin-walled ring muscle cylindrical member is comprised of special-shaped cavity and modal circumferential stiffening rib etc. has the integrated sheet-metal member of sealing complex section shape.The difficult point that its main feature also namely be shaped to be made is that cylindrical shell and gusset can't be realized monolithic molding when wall thickness is thinner.Therefore for wall thickness less than the 2mm member of 1mm particularly, have to now to adopt the split compromise mode of Combination Welding then of being shaped to finish the shaping processing of thin-walled ring muscle cylindrical member on the engineering.Split shaping Combination Welding refers to first but member is dissectd several lamellar bodies into punching press, spinning or superplastic forming along warp and parallel, then each the lamellar body Combination Welding after being shaped is formed cylindrical shell together, at last the upper reinforcement of welding again.Introduce many longitudinal and transverse weld seams on the cylindrical shell, greatly reduce reliability and the fatigue behaviour of member.Because the introducing of welding residual stress and sweating heat distortion, member dimension type precision significantly reduces.And contemporary aircraft is in order to dissolve that structure light wt is efficient, the contradiction between high reliability, long-life, multi-functional, the quick response etc., requires to adopt the member of thin-walled, integral body (no-welding-seam), higher-dimension shape precision to replace tradition minute block welding or riveted structure.Document [1] proposes a kind of plane wallboard filler roll bending integral forming process, namely by filled plastics or rubber in muscle lattice in length and breadth, then by three roller roll formings.Therefore from its mould structure or Forming Theory and the present invention essential distinction is arranged all.And the wallboard filler roll forming technique that document [1] proposes can not be shaped wall thickness less than the thin-wall part of 2mm, and particularly can not be shaped has the thin-wall tube-shaped member of closed cross-section form.Document [2] proposes a kind of thin-wall tube-shaped member hydroforming technology, is used for having the shaping of closed cross-section hollow unit.This technique is mainly by the two ends feed supplement, and the pressure effect makes the pipe distortion in cooperating simultaneously, and forming process can only by interior pressure-controlled pipe stress state, can't realize the self-regulation of local deformation.Can only be used for acyclic to the be more or less the same shaping of member of muscle and each position deflection of bulging district.Document [3] proposes the internal and external pressurization compound forming method of the special-shaped curved part of a kind of axial symmetry thin-walled large section ratio, and this technique is only applicable to the shaping without the reinforcement member equally, is that loading principle or applicable object and the present invention have essential distinction.
List of references
1. Xiao Han, Jinsong ZHANG, Zhang Shihong etc. the external integral panel filler of rib roll forming technical study. material engineering, 2010,8:56-60.
2. garden generation sword, Li Hongyang wears the elder brother, Lang Lihui, Wang Zhongren. internal high pressure forming of lightweight structures. and 1999,7:139-142.
3. Wang Zhong is golden, high iron army, Liu Jianguang, Li Yi. the internal and external pressurization compound forming method of the special-shaped curved part of a kind of axial symmetry thin-walled large section ratio. and Chinese invention patent, 2007, grant number: ZL200610151056.2.
Summary of the invention
Purpose of the present invention is exactly in view of the foregoing defects the prior art has, a kind of integral forming process method of thin-walled ring muscle cylindrical member is provided, the present invention can realize the one step forming of thin-walled ring muscle cylindrical member, the operations such as split shaping secondary connection have been saved, avoided the introducing of welding line joint and sweating heat distortion, greatly improve reliability, the dimension type precision of member, reduced processing cost.
Its technical scheme is: realized by following steps:
(A), the mould operation is prepared:
Spout hole is offered at a, position corresponding with reinforcement on mold cavity, and is provided with flow control valve;
B, making seamless thin wall cylinder adopt spinning process to prepare the seamless thin wall cylinder,
The demand of c, the whole drip molding of foundation bends to the seamless thin wall cylinder that axis is space curve with thin wall cylinder, and wherein, the axis of seamless thin wall cylinder is consistent with the axis of whole drip molding,
D, making reinforcement, directly jacking obtains on the plate of plane,
E, reinforcement namely are welded on the ready seamless thin wall cylinder before shaping, produce initial strip muscle pipe,
F, initial strip muscle pipe is put into the mold cavity that is comprised of upper die and lower die,
G, form mould by upper die and lower die, matched moulds also applies mold clamping force, by left drift and right drift sealing is carried out in the end of initial strip muscle pipe,
H, by strain hardening and strain-rate sensitivity medium charge passage to filling strain hardening and strain-rate sensitivity shaping medium between mould and initial strip muscle pipe,
I, by liquid medium filling passage to the inner filling liquid shaping medium of initial strip muscle pipe;
(B), be shaped:
The fluid pressure of a, increase seamless thin wall cylinder inside,
B, in this simultaneously adjust flux control valve control strain hardening and strain-rate sensitivity medium fluidised form, impel the compatible deformation of seamless thin wall cylinder and reinforcement,
C, rising initial strip muscle pipe internal pressure to pipe paste mould fully, and pressurize 3～5s;
(C), pickup:
A, lay down the internal pressure of initial strip muscle pipe,
B, sealing punch retreat to separating fully with mold cavity,
C, open mould, from mould, take out part.
Preferably, the quantity of above-mentioned spout hole and sectional area thereof are chosen according to the bulging amount of whole drip molding and the relative ratio of height to thickness of reinforcement, the principle of choosing is as follows: the bulging amount greatly then increases spout hole quantity and reduces the spout hole sectional area, and the reinforcement ratio of height to thickness greatly then increases spout hole quantity and reduces the spout hole sectional area.
Preferably, above-mentioned seamless thin wall cylinder and reinforcement adopt aluminium alloy, stainless steel, high temperature alloy or titanium alloy to make, and the wall thickness of seamless thin wall cylinder and reinforcement is 0.5-5mm.
Preferably, above-mentioned strain hardening and strain-rate sensitivity power transmission medium is the high molecular polymer semi-solid material, and the molecular weight of high molecular polymer semi-solid material is 100000 ~ 1000000g/mol, and the viscosity of high molecular polymer semi-solid material is 8000 ~ 20000Pas.
The invention has the beneficial effects as follows: compare the split forming technique; the two medium differential pressures of thin-walled ring muscle cylindrical member are shaped and adopt fluid as the power transmission medium; realized the loading mode of ring rib component compatible deformation; the space-closed variable cross-section die cavity that fluid media (medium) can adapt to dark chamber member flexibly changes, and has realized the monolithic molding of thin-walled ring muscle cylindrical member.Formed parts without other weld seams, has particularly been avoided longitudinal seam except hoop reinforcement position fully, has improved globality and the reliability of member.The fluid loading mode has fundamentally been eliminated gusset rollover moment, and the restrictive function of thin muscle to being shaped that weakened is particularly suitable for thin-wall part and is shaped.Process sequence changes into and welds first reinforcement and then be shaped, and need not the split assembly welding, has reduced sweating heat distortion and welding residual stress, and the dimension type precision of drip molding is largely increased.Compare the conventional fluid forming technique, the inside and outside filling of cavity power transmission medium of different nature during this process forming.By the force-transfer characteristic difference of inside and outside medium, realize the differential pressure loading environment that distortion is required, provide and eliminate the uneven required non-homogeneous pressure field of distortion, different parts is under the different stress is out of shape, realize that the coordination at each position of thin-walled ring muscle cylindrical member is shaped.Because differential pressure is that physical characteristic by medium self forms, can produce the continuous pressure gradient therefore need not to arrange a plurality of independent pressure liquid chambers, avoided the technical barrier that high pressure dynamic sealing, Components Shape change the mold closing internal high pressure forming such as not visible.Add flow control valve in mould spout hole position, spill-out by control strain hardening and strain-rate sensitivity medium and overflow speed, give full play to the regulating action of its compatibility of deformation, further guaranteed the harmony control of zones of different rate of deformation, and then promote the compatible deformation of cylindrical shell and gusset; It is few that this process has forming process, low cost of manufacture, the characteristics such as the member integrated that of being shaped is good.The present invention is reasonable in design, be convenient to implement, effect is remarkable, has stronger promotional value.
Description of drawings
Fig. 1 is mould schematic diagram of the present invention;
Fig. 1 .1 is the a-a cutaway view of Fig. 1;
Fig. 1 .2 is the b-b cutaway view of Fig. 1;
Fig. 2 is the schematic diagram of light-wall pipe bending;
Fig. 3 is the schematic diagram of reinforcement jacking;
Fig. 4 is the assembling schematic diagram of initial strip muscle pipe;
Fig. 5 is the schematic diagram that initial strip muscle pipe is put into mould;
Fig. 6 is the schematic diagram of matched moulds, axial seal;
Fig. 7 is the schematic diagram of filling strain hardening and strain-rate sensitivity medium between mould and cylindrical shell;
Fig. 7 .1 is the a-a cutaway view of Fig. 7;
Fig. 7 .2 is the b-b cutaway view of Fig. 7;
Fig. 8 is the schematic diagram of inner barrel fill liquid power transmission medium;
Fig. 9 is the schematic diagram of press molding;
Fig. 9 .1 is the a-a cutaway view of Fig. 9;
Fig. 9 .2 is the b-b cutaway view of Fig. 9;
Figure 10 is the schematic diagram that is shaped eventually;
Among the upper figure: patrix 1, right drift 2, liquid medium filling passage 3, counterdie 4, strain hardening and strain-rate sensitivity medium charge passage 5,7, left drift 6, spout hole 8, flow control valve 9, thin wall cylinder 10, seamless thin wall cylinder 11, plane plate 12, reinforcement 13,14, initial strip muscle pipe 15.
The specific embodiment
1-10 by reference to the accompanying drawings, the invention will be further described:
1, the mould operation is prepared,
A, making mould, mould is comprised of patrix 1, counterdie 4 and sealing punch, mold cavity is divided into feed zone, bulging district, sealing punch comprises left drift and right drift, above-mentioned same as the prior art, this does not give unnecessary details, offer spout hole 8 at the position corresponding with reinforcement, mould bulging district, shown in Fig. 1, Fig. 1 .1, Fig. 1 .2, the quantity of spout hole and diameter are decided on the bulging amount of member and the ratio of height to thickness of reinforcement, design principle is as follows: the bulging amount is greater than 15%, and spout hole quantity should be no less than 20, and sectional area is difficult for the initial strip muscle pipe sectional area greater than 5%; The reinforcement ratio of height to thickness is greater than 5, and spout hole quantity should be no less than 20, and sectional area is difficult for the initial strip muscle pipe sectional area greater than 5%,
B, making seamless thin wall cylinder adopt spinning process to prepare seamless thin wall cylinder 11,
The demand of c, the whole drip molding of foundation bends to the seamless thin wall cylinder 11 that axis is space curve with thin wall cylinder 10, and its main points are that the axis of seamless thin wall cylinder 11 is consistent with the axis of whole drip molding, as shown in Figure 2,
D, making reinforcement 13,14, directly jacking obtains on plane plate 12, as shown in Figure 3,
E, reinforcement 13,14 is welded on the no-welding-seam thin-walled cylinder 11, produces initial strip muscle pipe 15, as shown in Figure 4,
F, open the mould that is formed by patrix 1 and counterdie 4, initial strip muscle pipe 15 is put into mold cavity, as shown in Figure 5,
G, patrix 1 and counterdie 4 matched moulds, and apply corresponding mold clamping force, and its main points are that mold clamping force should be able to guarantee that upper and lower mould can not separate because interior voltage rise is high in the forming process, sealing is finished in the right drift 2 in the sealing punch and left drift 6 beginning axial feed to pipe ends, as shown in Figure 6
H, by strain hardening and strain-rate sensitivity medium charge passage 5,7 to filling the strain hardening and strain-rate sensitivity medium between mould and pipe, till being full of to die cavity between mould and pipe, as shown in Figure 7,
Till i, the liquid medium filling passage 3 by sealing punch are full of to the pipe die cavity fully to the inner filling liquid shaping medium of pipe (as shown in Figure 8),
2, be shaped,
A, increase the inner barrel fluid pressure by suitable speed, pressure speedup selection principle is for the pipe wall thickness in the thinner or larger situation of reinforcement ratio of height to thickness, should select larger pressure speedup, the situation thicker for the pipe wall thickness or the reinforcement ratio of height to thickness is less, the interior pressure speedup that then choosing should be lower
B, meanwhile adjust flux control valve 9 control strain hardening and strain-rate sensitivity medium fluidised forms, utilize the characteristics of its resistance of deformation self-reinforcing, form the gradient pressure distribution of eliminating the rate of deformation inequality, control seamless thin wall cylinder 11 and reinforcement 13,14 deformation sequence, guarantee cylindrical shell and the reinforcement of seamless thin wall cylinder, gusset namely, the synchronous coordination distortion
C, further pressure to the bulging district pipe that raises pastes mould fully, and 3～5 seconds of pressurize,
3, pickup,
A, initial strip muscle pipe 15 internal pressures are reduced to 0 MPa,
B, sealing punch retreat to separating fully with mold cavity,
C, open mould, from mould, take out part.
Need to prove: aluminium alloy, stainless steel, high temperature alloy and titanium alloy that present embodiment middle cylinder body and reinforcement material are well known to those skilled in the art.The wall thickness of present embodiment middle cylinder body and reinforcement is 0.5-5mm.
The high molecular polymer semi-solid material that strain hardening and strain-rate sensitivity power transmission medium is well known to those skilled in the art in the present embodiment, the molecular weight of high molecular polymer semi-solid material is 400000 ~ 600000g/mol, and the viscosity of high molecular polymer semi-solid material is 10000 ~ 16000Pas.Other is identical with the specific embodiment one.
The present invention be specially adapted to be shaped thin-walled, be with reinforcement, have the cylindrical parts such as complicated closed cross-section shape.
Claims (4)
1. the integral forming process method of a thin-walled ring muscle cylindrical member is characterized in that being realized by following steps:
(A), the mould operation is prepared:
A, spout hole (8) is offered at the position corresponding with reinforcement on mold cavity, and is provided with flow control valve (9);
B, making seamless thin wall cylinder adopt spinning process to prepare seamless thin wall cylinder (11),
The demand of c, the whole drip molding of foundation bends to the seamless thin wall cylinder (11) that axis is space curve with thin wall cylinder (10), and wherein, the axis of seamless thin wall cylinder is consistent with the axis of whole drip molding,
D, making reinforcement (13,14) obtain at the upper direct jacking of plane plate (12),
E, reinforcement namely are welded on the ready seamless thin wall cylinder (11) before shaping, produce initial strip muscle pipe (15),
F, initial strip muscle pipe (15) put into the mold cavity that is formed by patrix (1) and counterdie (4),
G, form mould by patrix (1) and counterdie (4), matched moulds also applies mold clamping force, seal by the end implementation to initial strip muscle pipe (15) of left drift (6) and right drift (2),
H, by strain hardening and strain-rate sensitivity medium charge passage (5,7) to filling strain hardening and strain-rate sensitivity shaping medium between mould and initial strip muscle pipe (15),
I, by liquid medium filling passage (3) to the inner filling liquid shaping medium of initial strip muscle pipe (15);
(B), be shaped:
A, the inner fluid pressure of increase seamless thin wall cylinder (11),
B, in this simultaneously adjust flux control valve (9) control strain hardening and strain-rate sensitivity medium fluidised form, impel the compatible deformation of seamless thin wall cylinder (11) and reinforcement (13,14),
C, rising initial strip muscle pipe (15) internal pressure to pipe paste mould fully, and pressurize 3～5s;
(C), pickup:
A, lay down the internal pressure of initial strip muscle pipe (15),
B, sealing punch retreat to separating fully with mold cavity,
C, open mould, from mould, take out part.
2. the integral forming process method of thin-walled ring muscle cylindrical member according to claim 1, it is characterized in that: the quantity of described spout hole (8) and sectional area thereof are chosen according to the bulging amount of whole drip molding and the relative ratio of height to thickness of reinforcement, the principle of choosing is as follows: the bulging amount greatly then increases spout hole quantity and reduces the spout hole sectional area, and the reinforcement ratio of height to thickness greatly then increases spout hole quantity and reduces the spout hole sectional area.
3. the integral forming process method of thin-walled ring muscle cylindrical member according to claim 1, it is characterized in that: described seamless thin wall cylinder (11) and reinforcement (13,14) adopt aluminium alloy, stainless steel, high temperature alloy and titanium alloy to make, and the wall thickness of seamless thin wall cylinder and reinforcement is 0.5-5mm.
4. the integral forming process method of thin-walled ring muscle cylindrical member according to claim 1, it is characterized in that: described strain hardening and strain-rate sensitivity power transmission medium is the high molecular polymer semi-solid material, the molecular weight of high molecular polymer semi-solid material is 100000 ~ 1000000g/mol, and the viscosity of high molecular polymer semi-solid material is 8000 ~ 20000Pas.
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| CN103341543A (en) * | 2013-06-28 | 2013-10-09 | 哈尔滨工业大学 | Variable camber thin-walled part hoop flow forming device and method |
| CN103737240A (en) * | 2013-07-10 | 2014-04-23 | 李会发 | Method for manufacturing electrode container in standardized manner |
| CN107520328A (en) * | 2017-06-21 | 2017-12-29 | 保隆(安徽)汽车配件有限公司 | A kind of forming elbow method and bend pipe mould |
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| CN109794732A (en) * | 2018-12-27 | 2019-05-24 | 天津航天长征技术装备有限公司 | A kind of aluminium alloy thin-walled cylinder section rolls-and inula closes accurate forming method |
| CN110936041A (en) * | 2019-10-15 | 2020-03-31 | 武汉船用机械有限责任公司 | Method for manufacturing double-cylinder ring beam |
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| CN112893849A (en) * | 2021-01-18 | 2021-06-04 | 北京航空航天大学 | Powder-solid coupling forming device and method for multiple layers of ribs in thin-wall part |
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| CN113319185A (en) * | 2021-06-08 | 2021-08-31 | 哈尔滨工业大学 | Fluid pressure forming device and method for large-diameter thin-wall cylindrical part |
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| CN112893849A (en) * | 2021-01-18 | 2021-06-04 | 北京航空航天大学 | Powder-solid coupling forming device and method for multiple layers of ribs in thin-wall part |
| CN113084463A (en) * | 2021-04-20 | 2021-07-09 | 中国直升机设计研究所 | Method for machining outer sleeve of infrared stealth device of helicopter |
| CN113084463B (en) * | 2021-04-20 | 2022-09-16 | 中国直升机设计研究所 | Method for machining outer sleeve of infrared stealth device of helicopter |
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| CN113878019A (en) * | 2021-10-15 | 2022-01-04 | 长安大学 | Forming process of cylinder reinforcing rib based on electro-plasticity and impact |
| CN113878019B (en) * | 2021-10-15 | 2024-03-26 | 长安大学 | Forming process of cylinder reinforcing rib based on electro-plasticity and impact |
| CN117066822A (en) * | 2023-08-10 | 2023-11-17 | 中国科学院近代物理研究所 | Manufacturing method of ultrathin-wall vacuum chamber with reinforcing rib structure |
| CN117066822B (en) * | 2023-08-10 | 2024-04-09 | 中国科学院近代物理研究所 | Manufacturing method of ultrathin-wall vacuum chamber with reinforcing rib structure |
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